Plumbing fitting



FIG. 1 is a top perspective view of my new design for the plumbing fitting;

FIG. 2 is a bottom perspective view of my new design for the plumbing fitting;

FIG. 3 is a top plan view of my new design for the plumbing fitting;

FIG. 4 is a side view showing two sides of the nut of my new design for the plumbing fitting;

FIG. 5 is a bottom plan view of my new design for the plumbing fitting;

FIG. 6 is a side view showing three sides of the nut of my new design for the plumbing fitting; and,

FIG. 7 is a cross-sectional view along line 7, 7 of FIG. 4, of my new design for the plumbing fitting. 

CLAIM An ornamental design for a plumbing fitting, as shown and described. 